help about changing day and hour of thousand of files

I have found out in thousands of files i had from downloads from like 1-2 years ago something. The app i used in the past no longer works and now im using other but it download it with a 3 hour difference compared to my old database.

What i need is a way to batch change the hour difference in filenames and in some cases even the day of all my old database.

For example i need to change from this 2021-02-11 11.24.09 -> 2021-02-11 14.24.09
In cases it changes day it need to take that in account automatically:
2020-05-09 21.45.21 -> 2020-05-10 00.45.21

What kind of commands need to add the ARen?

Use a Script method.

Extract Y, M, D, h, m & s using a regular expression match.
Add 3 to h
Create a new Date
Extract Y, M, D, h, m & s from the new date
Format and return.

This script should do it:

deltaHour = 3;
match = item.name.match(/^(\d{4})-(\d{2})-(\d{2}) (\d{2})\.(\d{2})\.(\d{2})/);
log(match);
if (match) {
Y = 1*match[1];
M = 1*match[2] - 1;
D = 1*match[3];
h = 1*match[4];
m = 1*match[5];
s = 1*match[6];
h += deltaHour;
date = new Date(Y, M, D, h, m, s);
Y = date.getFullYear();
M = date.getMonth() + 1;
D = date.getDate();
h = date.getHours();
m = date.getMinutes();
s = date.getSeconds();
return Y + "-" + ("0" + M).slice(-2)+ "-" + ("0" + D).slice(-2)
+ " " + ("0" + h).slice(-2) + "." + ("0" + m).slice(-2) + "." + ("0" + s).slice(-2);
}

Reply to #2:
Wow that is amazing, thanks.
Just one question how can i make it respect the rest of the filename without deleting it?
2020-05-09 21.45.21 xxxxxxxxxxxxx.jpg -> 2020-05-10 00.45.21 xxxxxxxxxxxxx.jpg

Reply to #3:

deltaHour = 3;
match = item.name.match(/^(\d{4})-(\d{2})-(\d{2}) (\d{2})\.(\d{2})\.(\d{2})(.*)/);
if (match) {
Y = 1*match[1];
M = 1*match[2] - 1;
D = 1*match[3];
h = 1*match[4];
m = 1*match[5];
s = 1*match[6];
h += deltaHour;
date = new Date(Y, M, D, h, m, s);
Y = date.getFullYear();
M = date.getMonth() + 1;
D = date.getDate();
h = date.getHours();
m = date.getMinutes();
s = date.getSeconds();
return Y + "-" + ("0" + M).slice(-2)+ "-" + ("0" + D).slice(-2)
+ " " + ("0" + h).slice(-2) + "." + ("0" + m).slice(-2) + "." + ("0" + s).slice(-2)
+ match[7];
}

Reply to #4:

You are very smart, thank you very much.

Reply to #5:
If I want to use the following fields off the file metadata, but like the post the time is off by 7 hours to, how can you modify the script to add the hours.

In this case, I am removing the entire file name and rebuilding it off the date and time using the Varibles:
<Video Date Year><Video Date Month><Video Date Day>_<Video Date Hour><Video Date Min><Video Date Sec>

and then i need to change the time by +7 hours, and then I want to just add text at the end like:
"DroneVideo" using the "Add" predefined option

Reply to #6:

The following script will do it...

dH = 7;
suffix = "_DroneVideo";
date = new Date(item.videoDate);
Y = date.getFullYear();
if (Y != 1899) {
h = date.getHours();
date.setHours(h+dH);
Y = date.getFullYear();
M = date.getMonth() + 1;
D = date.getDate();
h = date.getHours();
m = date.getMinutes();
s = date.getSeconds();
return Y + ("0" + M).slice(-2)+ ("0" + D).slice(-2) + "_"
+ ("0" + h).slice(-2) + ("0" + m).slice(-2) + ("0" + s).slice(-2)
+ suffix;
}

The odd statement "if (Y != 1899)" is testing whether the videoDate tag exists before continuing with renaming the file.

If the tag is not present then item.videoDate will return a date corresponding to "time zero". For some bizarre reason, apparently originating with Microsoft Works, this corresponds to midnight on 30th December 1899.

This only occurs in a script - the error is trapped in other methods and an error message will be displayed.